//Program Mengontrol Nyala LED dengan Sensor LDR
#define ledPin 2
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600); //mengaktifkan fungsi serial
}

void loop() {
  int sensorValue = analogRead(A0); //membaca nilai LDR pada pin analog 0
  
  float voltage = sensorValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  
  Serial.print("Cahaya Sekitar: ");
  if (lux > 50) {
    Serial.println("Terang");
    digitalWrite(ledPin, LOW);
  } else {
    Serial.println("Gelap  ");
    digitalWrite(ledPin, HIGH);
  }

  Serial.print("Intensitas Cahaya: ");
  Serial.print(lux);
  Serial.println(" Lux");
  delay(300);
}